Makes assumption on involvement of ISIS on base that they claim that "Russia will regret" is not too smart. I can remind you:
1) 2015-10-09 Vladimir Putin will lose the support of his people, when Russian troops will begin to suffer losses in Syria, according to a former US military general Mark Hёrtling. However, he noted that the long wait is not necessary: according to him, have already begun to appear reports of downed Russian helicopters and destroy tanks.
2) BRUSSELS, October 8 - RIA Novosti, Natalia Dobrovol'skaya. US Secretary of Defense Ashton Carter said that the actions of Russia in Syria will have consequences for Russia itself.
"It (Russia's actions in Syria) will have implications for Russia", - said the head of Pentagon reporters in Brussels. "I also expect that in the next few days the Russians will suffer in Syria", - he added.
But
I hope it doesn't mean that US was involved in bombing
